docs: def b64_print(s):
      """
      Prints a string with spaces at every b64_intro characters
      :param s: String to print
      :return: String
      """
      if USING_PYTHON2:
          string = str(s)
      else:
          string = str(s, 'utf8')
      return '\n'.join(
          string[pos:pos + b64_intro] for pos in range(0, len(string), b64_intro)
      )